If you’ve been driving your Subaru Legacy and noticed a pulsating feeling when you apply the brakes, you’re not alone. Many Subaru Legacy owners have experienced this issue, and it’s important to understand the common causes of this problem. In this article, we’ll discuss the most common causes of a pulsating brake pedal in the Subaru Legacy and how to fix them.
The pulsating brake pedal in your Subaru Legacy can result from various factors, with the most frequent cause being warped or unevenly worn brake rotors.
The inconsistent rotor surface in the brake rotors can lead to inconsistencies in brake pad contact, subsequently causing pulsations.
Issues with the brake calipers, wheel bearings, or suspension components may also cause your Taocom’s brake pedal to pulsate.
Why A Brake Pedal Might Pulsate When Braking
There are a few potential causes for brake pedal pulsation. Here are the most common ones:
Warped Rotors (Most Common Reason)
One of the most common reasons is warped brake rotors. As you apply the brakes, the brake pads clamp down on these rotors, which creates friction and slows down your vehicle.
Over time, the heat generated can cause the rotors to warp, leading to inconsistent contact between the brake pad and rotor.
It could be one or all the rotors that are warped. If your Legacy has discs on each wheel, start with the driver’s side front wheel. That’s the rotor that usually wears the fastest.
After that, check the passenger side rotor.
Worn Brake Pads
Another possible cause of a pulsating brake pedal in the Subaru Legacy is uneven brake pad wear. If you neglect to replace your brake pads, they might eventually start to wear unevenly, possibly due to debris or caliper issues.
This uneven wear can create an imbalance when braking, resulting in pedal pulsation. Regular brake maintenance, including replacing brake pads when needed, can help prevent this issue.
Additionally, brake caliper issues can result in pulsating brakes. The calipers hold your brake pads and squeeze them against the rotors when you press the brake pedal.
If the calipers don’t release properly when you release the brake pedal, they can cause the pads to drag on the rotors, leading to pulsation.
Other (Not as Common) Causes
There could be various reasons behind your Subaru Legacy’s brake pedal pulsation. Understanding these causes is crucial for timely and effective solutions. This section will discuss a few possible reasons that can lead to brake pedal pulsation in your Subaru Legacy.
Another possibility is loose or worn wheel bearings. When these components wear out or become loose, they can cause excessive vibration or movement in your Legacy’s suspension system.
This, in turn, can lead to brake pedal pulsation. Inspecting and replacing the wheel bearings may resolve the issue.
Incorrect Brake Job
In some cases, improper brake pad installation could be the culprit behind brake pedal pulsation in your Subaru Legacy.
If the brake pads are not correctly installed or aligned, they might not make even contact with the rotors, resulting in a pulsating sensation.
Ensure that your brake pads are installed by a professional or follow the proper installation procedures when doing it yourself.
Lastly, tire imbalance or alignment issues can contribute to brake pedal pulsation. If your tires are unbalanced or your vehicle’s alignment is off, it can generate vibrations that you might feel in your brake pedal.
In such cases, balancing your tires and vehicle alignment can help rectify the problem.
Remember, while these are some common causes of brake pedal pulsation in your Subaru Legacy, it is vital to consult a professional mechanic for precise diagnosis and repair recommendations tailored to your vehicle.
How to Detect Pulsation
Here are a few guidelines that will help you determine if your Subaru Legacy is experiencing brake pedal pulsation.
Firstly, pay close attention to the behavior of your brake pedal while driving. If you feel a slight vibration or shaking when you press the brake pedal, it signals that there could be an issue with your brake system. This sensation will likely increase as you apply more pressure to the brakes.
Next, notice the speed at which the pulsation occurs. Brake pulsation is often more noticeable at higher speeds. If you start to feel the vibration when you apply the brakes while traveling at highway speeds, this could indicate a problem with your brake rotors.
Another vital factor to consider is brake pedal travel. If your Subaru Legacy’s brake pedal has too much travel or feels soft when you press it, this may also be a sign of pulsation. This could be caused by uneven wear on the rotor surfaces or brake pad deposits on the rotors.
Safety Risks Associated
A pulsating brake pedal in your Subaru Legacy can pose several safety risks. First and foremost, it may cause a degradation in braking performance.
The uneven pressure applied to the brakes can result in longer stopping distances, increasing the chances of a collision.
In addition, inconsistent braking may cause your vehicle to pull to one side, compromising your control and stability while driving.
Regular maintenance of your Subaru Legacy can help prevent brake pedal from pulsating. Here are some steps you can take to keep your brakes in good condition and minimize the risk of pulsating:
- Inspect your brake pads regularly: Check your brake pads for signs of wear, such as thinning or uneven wear patterns. Replace your brake pads if they are less than 1/4 inch thick or if you notice uneven wear.
- Replace your brake rotors: If your rotors are warped or damaged, it may also cause brake pedal to pulsate. Replace your rotors to ensure proper contact between the rotors and brake pads.
- Clean your brake components: Keep your brake components clean by wiping them down with a damp cloth or using a brake cleaner spray. This will help remove any dirt, grease, or other contaminants that can cause your brake pedal to pulsate.
- Bleed your brakes: Bleeding your brakes helps to remove air bubbles from your brake lines which can contribute to brake pedal pulsation. You can do this by having a professional mechanic perform a brake fluid flush or by doing it yourself using a brake bleeder kit.
- Maintain your tires: Proper tire maintenance can also help prevent brake pedal pulsating. Make sure your tires are properly inflated, rotated regularly, and have sufficient tread to grip the road.
By following these preventive measures, you can help reduce the likelihood of experiencing brake pedal pulsation in your Subaru Legacy and ensure smooth, consistent stopping power.
Steps in Fixing Pulsating Brake Pedal
Having a pulsating brake pedal in your Subaru Legacy can be annoying and potentially dangerous. Here are some steps to help you diagnose and fix the issue:
- Identify the cause: First, you need to determine the cause of the pulsation. Common reasons include warped brake rotors, uneven brake pad wear, or a malfunctioning ABS system.
- Inspect your brakes: Park your Legacy on a safe, level surface, and with the engine off, check your brake system. Look for signs of wear or damage on the brake pads, rotors, and calipers. Be sure to inspect both front and rear brakes.
- Warped rotors or uneven pad wear: If you find that your rotors are warped or your brake pads are unevenly worn, you may need to either replace or resurface the rotors and replace the brake pads.
- Resurfacing rotors: If the rotor thickness is within the manufacturer’s specifications, you can resurface the rotors to provide a smooth braking surface. Ensure that this is done evenly and to the correct specifications.
- Replacing the brake pads: The brake pads need to be replaced when they are worn, cracked, or damaged. Install high-quality brake pads compatible with your Legacy, and ensure that they are properly seated against the rotors.
- ABS malfunction: If the ABS system is the cause of the pulsating brake pedal, you may need to consult a professional or refer to your vehicle’s service manual for specific diagnostic steps and possible repair procedures. This might involve checking the wheel speed sensors, ABS pump, and ABS module for faults.
- Bleed the brake system: Air bubbles trapped in the brake fluid can result in a spongy or pulsating brake pedal. To fix this issue, bleed the brake system by following the appropriate procedure in your Legacy’s service manual. This typically involves pumping the brake pedal, opening the brake bleeder valve, allowing the air and brake fluid to escape until no more bubbles are visible, and then closing the valve. Be sure to use the correct brake fluid specified for your vehicle and top up the reservoir if needed.
- Test drive: Once you’ve completed the necessary repairs, take your Legacy for a test drive to ensure that the pulsating brake pedal issue has been resolved. Pay close attention to the brake pedal feel and overall braking performance. If the problem persists, you may want to consult a professional mechanic for further assistance.
Prolonging Brake System Life
To prolong your Subaru Legacy’s brake system life, there are a few crucial maintenance steps you can take. Keeping up with these practices will ensure optimal braking performance and help prevent brake pedal pulsation.
1. Check and replace brake pads as needed: Regularly inspect your brake pads to assess their wear. Replace them when they reach approximately 3mm in thickness to prevent damage to the rotors.
2. Schedule regular brake fluid changes: Over time, brake fluid can absorb moisture, which can cause components to corrode. Changing your brake fluid every two years or 30,000 miles prevents this corrosion, ensuring a long-lasting brake system.
3. Keep an eye on your rotors: Rotors are subjected to high heat and friction, which can lead to warping and inconsistencies over time. If you notice signs of wear, such as grooves or uneven surfaces, consider resurfacing or replacing the rotors.
4. Respect the break-in period: New components, such as brake pads and rotors, need time to wear-in until they deliver optimal performance. During the first 300 to 500 miles, avoid sudden and hard braking to ensure proper settling of the new components.
5. Monitor tire pressure: Maintaining correct tire pressure ensures even contact with the road, which contributes to even brake wear. Check your tire pressure at least once a month and adjust as needed.
6. Keep an ear out for brake noise: Unusual or persistent brake noise can signal a problem with your brake system. If you hear squeaking, grinding, or other unusual noises, have your brake system inspected by a professional.
Following these steps will help extend the life of your Subaru Legacy’s brake system, improve braking performance, and reduce the likelihood of brake pedal pulsation. Remember that regular maintenance is key to keeping your vehicle running smoothly and safely.
In conclusion, it is important to be aware of the common causes of a pulsating brake pedal in a Subaru Legacy. While the most common cause of this problem is warped brake rotors, it can also be caused by other issues such as a misaligned caliper, worn brake pads, or a stuck brake caliper piston. If you are experiencing a pulsating brake pedal, it is important to have your vehicle inspected by a qualified mechanic to determine the cause and have the issue resolved.